Cupola-furnace.



2 Sheets-Sheet I.

Patented Feb. 20, I900.

D. TOWNSEND. cuPoLA FURNACE.

filed Mar. 18, 1899'.)

' (Application (No Model.)

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I W, h 2.. m 1 m x W M 0 o m 0 2 b e F d CUPOLA FURNACE. 1

(Application filed Mar. 18, 1899.1

2 Sheets-Sheet 2 (No Model.)

UNITED STATES PATENT OFFICE.

DAVID TOWNSEND, PHILADELPHIA, PENNSYLVANIA.

ouPoLA-FuRNAoE.

SPECIFICATION forming part of Letters Patent N 0. 643,920, datedFebruary 20, 190i).

Application filed March 18, 1899.

T0 ttZZ whom it may-concern:

Be it known that I, DAVID TOWNSEND, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Cupola-Furnaces, of which the following is aspecification.

hereinafter, reference being had to the accompanying drawings, in whichFigure 1 is a sectional plan view of my improved cupola-furnace. Fig. 2is a sectional elevation of the lower part of the furnace on the line 22, Fig. 1, showing a car in position and the doors closed. Fig. 3 is aView similar to Fig. 2, showing the doors opened, so as to allow theslag to discharge into the car. Fig. 4 is a section on the line 4 4:,Fig. 1. Fig. 5 is a detached perspective view of the retaining-bar forthe doors, and Figs. 6 and 7 are perspective views of details of theinvention.

A is the foundation on which the furnace rests, and A are standards(four in the present instance) supporting the body B of thecupolafurnace, which is of the ordinary construction. A masonrystructure may be substituted for the standards A, if desirable.

D D are doors mounted on shafts E E, respectively. These shafts aresupported in suitable bearings on the standards A. The door D has a lipd, which underlaps the edge of the door D, and when the doors are in theclosed position, as shown in Fig. 2, they fit tightly against the underside of the body of the cupola-furnace; but when the doors are opened,as shown in Fig. 3, they rest clear of the lower portion of the furnace,so that the slag as it is discharged will in most instances clear thedoors and flow into the car or other Serial No. 709,668. (No moan.)

on. The weights will counterbalance the doors, so that they can bereadily turned on their pivots. In order to support the doors in theclosed position without using a prop or other contri'vance which willinterfere with the free movement of the cars under the cupola, I pivotto the door D a retaining-bar C by a pivot-bolt d,having a square headadapted to a recess in the door and provided at its lower end with a nutand washer. g

The bar 0 is made up of two longitudinal members 0 c, Fig. 5, apivot-block c at the center, through which the pivot-pin d passes, andblocks 0 0 one at each end. The under face of each of these blocks isbeveled, as shown clearly in Figs. 2 and at, and the beveled block 0 isprovided with gear-teeth c, with which engages a screw f on thescrewshaft F.

Extending from one standard A to another are two beams G, one at eachside of the eupola-furnace, and secured to the inner side of each beamis a bracket g,(shown in the perspective View Fig. 6,) having aninclined face g. These brackets are situated in line with the blocks c 0so that when the bar 0 is turned on its pivot the beveled faces of thebar will travel upon the inclined faces of the brackets, so as to forcethe doors tightly against the under side of the body of the cupola-furnace. The turning of this bar may be accomplished by hand, usingpinch-bars or levers; but I prefer to use a screw-shaft F, having ascrew f engaging with the teeth 0 on the cam-block f of the bar 0.

The shaft F is adapted to bearings f on the frame F, secured to thecross-beam G and to one of the brackets, and is also adapted to abearing f projecting from one of the standards A, as clearly illustratedin Fig. 1. The frame F is illustrated in detail in Fig. 7.

By arranging the screw on an incline, as shown, it is within easy accessof the attendant at the furnace, and at the same time it is clear ofboth of the counterbalance-weights, although in some instancesthe shaftmay be arranged horizontal instead of on an incline.

In order that the pivot-bar will remain in a fixed position when thedoor is opened, I attach a weight 0 on one end of the bar and place astop d on the door, so that the weight when the door is opened willcause the bar to swing until it strikes the stop and is parallel withthe edge of the door.

The car H, which Iprefer to use in connection with my improvedcupola-furnace, is of the form clearly shown in Fig. 2, having axles Iresting in bearings h, secured to the body of the car, and on the axlesare flanged wheels 11, adapted to the rails of a track extending underthe cupola-furnace. The bottom of the car-body is high in the middle andinclined toward each side, and extending from the bottom of the car isan inclined partition h, arranged to separate the slag, so that it canbe readily discharged. The sides 7L2 of the car are pivoted at k andopened outwardly, and connected to each side of the car at each end arerack-bars k engaging with pinions W, the rack-bar 70 being mounted abovethe pinion and the bar It being mounted below the pinion. The pinionsare mounted on the longitudinal shaft K, and hung on this shaft arelinks 012, carrying rollers which keep the rackbars in gear with thepinion no matter what position the swinging sides of the car are in. Onone end of the shaft K is a gear-wheel n, meshing with the pinion n onthe handled shaft N, provided with a suitable handle n Then the handleis turned, the doors will be simultaneously opened or closed. Pawls nare provided to lock the pinion n in any position.

It will be seen by referring to the sectional view, Fig. 3, that thecar-body simply rests on the ends of the axles, so that the axles can bereadily removed from the car when required, and there is no chance forthe accumulation of grit, and the wheels are loose on their axles, sothat they can turn independently of the axles or the axles can turn intheir bearings.

Thus it will be seen that after the cupolafurnace has been charged andthe metal run off the slag can be readily discharged from the bottom ofthe furnace by turning the screw-shaft F so as to turn the bar 0 on itspivot and release the bottom doors D D. The weight of the slag willcause the doors to open, and in the meantime a car has been run on thetracks directly under the cupola, so that when the doors are opened theslag will fall directly into the car. The bar 0 will, owing to itscounterweight, rest against the stop (1 After the contents of the cupolais discharged the doors being relieved of the weight of the slag theycan be readily closed by the operator, as the weights e counterbalancethe doors.

lVhen the doors are in position, the teeth on the bar will be inengagement with the screw j, which can then be turned so that the barwill travel over the inclined faces of the brackets and force the doorstightly against the under side of the cupola-bottom. The car can betraversed to the dump and discharged by simply turning the crank-handleM, which will open the doors simultaneously and allow the slag to escapeat each side of the car, af-

ter which the car can be run under the cupola again, so as to be readyto receive another charge.

By this construction I am enabled to dispense entirely with the ordinaryprops used for supporting the bottoms of cupola-furnaces, which willprevent the placing of a car or other conveyer under the cupola prior tothe discharge of the slag, so that the slag must be discharged firstonto the ground and then loaded onto cars or trucks. Whena masonrystructure is used in place of the metal frame A, it may also support thebrackets 1, dispensing with the cross-beam G.

I claim as my in vention 1. The combination in acupola-furnace, of acupola-body, doors hinged to the under side of the body, one doorunderlapping the other, fixed supports at each side of the doors, abarpivoted to the underlapping door and adapted to engage the fixedsupports, and means engaging the bar so as to turn it on its pivot andlock the doors in the closed position, substantially as described.

2. The combination of the body of the furnace, a fixed support orfoundation for the same, hinged doors for closing the bottom of thefurnace, one door underlapping the other, a bar pivoted to theunderlappin g door, bevels on the bar, and inclines on the fixed portionof the structure cooperating with the bevels of the bar,whereby thedoors are forced tightly against the bottom of the body of thecupolafurnace, substantially as described.

3. The combination of the body of acupolafurnace, a fixed support orfoundation for the same, counterbalanced pivoted doors arranged to closethe bottom of the furnace, one door underlapping the other, and aretainingbar pivoted to the underlapping door, the ends of said barbeing supported on the fixed support of the structure and having on oneend teeth with a screw-shaft arranged to engage the teeth of the bar andturn it on its pivots to lock the doors in the closed position,substantially as described.

4. The combination in a cupola-furnace, of the pivoted doors mountedunder the body of the furnace, a retaining-bar pivoted to one of saiddoors and having a weight at one end and a stop on the door againstwhich the opposite end of the bar rests when the doors are opened,substantially as described.

5. The combination in a cupola-furnace, of the furnace-body, two pivoteddoors mounted under the same, one underlapping the other, aretaining-bar pivoted to the underlapping door, having cam-blocks ateach end, cross beams on the fixed structure, brackets on thecross-beams arranged on opposite sides of the parting-line of the doorsand in the path of the cross-bar, so that when the cross-bar is adjustedparallel with the parting-line of the doors, the doors will freely openbut when the bar is turned it will pass over the brackets and besupported thereby, substantially as described.

6. The combination in a cupola-furnace, of In testimony whereof I havesigned my the body, pivoted doors arranged to close the name to thisspecification in the presence of bottom of the furnace, aretaining-barpivoted two subscribing witnesses.

to one of the doors, said bar being made up DAVID TOWNSEND. 5 of twolongitudinal members, with a central Witnesses:

pivot-block and end cam-b1ocks,substantia11y WILL. A. BARR,

as described. Jos. H. KLEIN.

